SOUNDCRAFT. User Guide

Transcription

1 SOUNDCRAFT User Guide

2 Harman International Industries Ltd. 1995, 1996 All rights reserved Parts of the design of this product may be protected by worldwide patents. Part No. ZM0117 Issue 4 Soundcraft is a trading division of Harman International Industries Ltd. Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Soundcraft shall not be liable for loss or damage whatsoever arising from the use of information or any error contained in this manual. No part of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Soundcraft. It is recommended that all maintenance and service on the product should be carried out by Soundcraft or its authorised agents. Soundcraft cannot accept any liability whatsoever for any loss or damage caused by service, maintenance or repair by unauthorised personnel. Harman International Industries Limited. Cranborne House, Cranborne Road, Cranborne Industrial Estate, Potters Bar, Herts., EN6 3JN UK. Tel: Fax:

3 7DEOHRI&RQWHQWV 1.Introduction 1.1 Introduction 1.2 Warranty Installation 2.1 Dimensions 2.2 Meterbridge 2.3 EDAC Connectors 2.4 Rear Connector Panel D-type Connectors 2.6 Jumper Options 2.8 Internal Monitor Source Selection Block Diagrams 3.1 Mono Input Block Diagram 3.2 Group Module Block Diagram 3.3 Stereo Input Block Diagram 3.4 Stereo Group Module Block Diagram 3.5 ST1 /ST2 Master Block diagram 3.6 Monitor Block Diagram 3.7 Comms Block Diagram Functional Description 4.1 Mono Input Module 4.2 Stereo Input Module 4.8 Mono Group Module 4.14 Stereo Group Module 4.18 i

4 Master ST1 & ST2 Modules 4.22 Monitor Module 4.26 Communication Module 4.30 Meterbridge Modules Specifications 5.1 ii

5 1.Introduction B800 Introduction 1.1

6 ,QWURGXFWLRQ B800 Congratulations on purchasing a Soundcraft console. The B800 has been designed to meet today s needs of Live TV & Radio Broadcast and Production Facilities including OB vehicles. System Features The B800 features: 5 frame sizes: 24, 32, 40, 48 and 56 module-widths are available. 8 Mono Groups (or 4 Stereo Groups). 2 Stereo Master Outputs. 6 Mono Auxes & 2 Stereo Auxes. Stereo AFL/PFL 4 VCA Groups Power Supply The B800 uses the CPS275 Power Supply. 1.2 B800 Introduction

7 :DUUDQW\ 1 Soundcraft is a trading division of Harman International Industries Ltd. End User means the person who first puts the equipment into regular operation. Dealer means the person other than Soundcraft (if any) from whom the End User purchased the Equipment, provided such a person is authorised for this purpose by Soundcraft or its accredited Distributor. Equipment means the equipment supplied with this manual. 2 If within the period of twelve months from the date of delivery of the Equipment to the End User it shall prove defective by reason only of faulty materials and/or workmanship to such an extent that the effectiveness and/or usability thereof is materially affected the Equipment or the defective component should be returned to the Dealer or to Soundcraft and subject to the following conditions the Dealer or Soundcraft will repair or replace the defective components. Any components replaced will become the property of Soundcraft. 3 Any Equipment or component returned will be at the risk of the End User whilst in transit (both to and from the Dealer or Soundcraft) and postage must be prepaid. 4 This warranty shall only be available if: a) the Equipment has been properly installed in accordance with instructions contained in Soundcraft s manual; and b) the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing; and c) no persons other than authorised representatives of Soundcraft or the Dealer have effected any replacement of parts maintenance adjustments or repairs to the Equipment; and d) the End User has used the Equipment only for such purposes as Soundcraft recommends, with only such operating supplies as meet Soundcraft s specifications and otherwise in all respects in accordance Soundcraft s recommendations. 5 Defects arising as a result of the following are not covered by this Warranty: faulty or negligent handling, chemical or electro-chemical or electrical influences, accidental damage, Acts of God, neglect, deficiency in electrical power, air-conditioning or humidity control. 6. The benefit of this Warranty may not be assigned by the End User. 7. End Users who are consumers should note their rights under this Warranty are in addition to and do not affect any other rights to which they may be entitled against the seller of the Equipment. B800 Introduction 1.3

8 1.4 B800 Introduction

9 2. Installation B800 Installation 2.1

10 'LPHQVLRQV 2.2 B800 Installation

11 (DUWKLQJ7KH&RQVROH Important Notice. The console has two earth posts on the rear connector panel. They are located near to the power supply connectors. The un-insulated metal post is the chassis ground, and the insulated post is the system ground. The console is supplied with these two posts linked together. It is essential that the console is operated with these two earths linked. They may, however, be linked at a different point in the installation: for example, a technical earth in the installation site. In this case the wire link between the two posts must be removed. 0HWHUEULGJH The meterbridge has a number of connectors as shown below. The MONITOR/COMMS D-type connector routes signals to the Monitor Selector PCB ( see the Meterbridge connector list on the previous page for pin details). The ANCILLARY METERS D-type connector carries the Groups and Auxes into the meterbridge. The actual connections used will depend on the number of ancillary meters which are fitted. The connections are: 1 Gnd 14 Gnd 2 Group8 15 Group7 3 Group6 16 Group5 4 Group4 17 Group3 5 Group2 18 Group1 6 Not Used 19 Not Used 7 Not Used 20 Not Used 8 Aux1 21 Aux2 9 Aux3 22 Aux4 10 Aux5 23 Aux6 11 Aux7L 24 Aux7R 12 Aux8L 25 Aux8R 13 Not Used The EXTERNAL INPUTS XLRs are also routed to the Monitor Selector PCB. The inputs here may be monitored on the Meters which are associated with the Monitor Selector PCB. There are also 2 additional XLRs. The first of this is commonly used to connect the T/B Mic feed from the meterbridge to the T/Binput in the console, via the XLR on the flying lead. The second XLR is for future expansion. B800 Installation 2.3

12 5HDU&RQQHFWRU3DQHO('$&&RQQHFWRUV There are two 90-way EDAC s associated with the master section. Viewed from the rear of the console, EDAC1is to the right of EDAC2. These 2 EDAC s have the functions described on the next pages. Other EDACs on the console may be for stereo group and stereo channel outputs, and wiring information for these will be specified to each console and is therefore supplied separately. These EDAC receptacles, often known as female, have pins which are surrounded by a protruding plastic moulding. The photograph below shows the pin labelling (as viewed from the outside of the console). CW CN CF BY BS BJ BD AZ AV AM AE X R H A DB CVCM CE BX BR BH BC AY AU AL AD W P F The pins are listed in circuits below - the circuit functions for each EDAC are shown on the following pages. HI (+) LO (-) GND CCT 1 A B C CCT 2 H J K CCT 3 R S T CCT 4 X Y Z CCT 5 AE AF AH CCT 6 AM AN AP CCT 7 BJ BK BL CCT 8 BS BI BU CCT 9 BY BZ CA CCT 10 CF CH CJ CCT 11 CN CP CR CCT 12 CW CX CY CCT 13 F E D CCT 14 P N M CCT 15 W V U CCT 16 AD AC AB CCT 17 AL AK AJ CCT 18 AU AT AS CCT 19 BR BP BN CCT 20 BX BW BV CCT 21 CE CD CC CCT 22 CM CL CK CCT 23 CV CU CT CCT 24 DB PA CZ 2.4 B800 Installation

13 :D\('$& 'HWDLOV EDAC 1 Circuit Number Function CCT 1 not used CCT 2 Ext Cue I/P CCT 3 Prod T/B I/P CCT 4 T/B to Ext CCT 5 Oscillator L CCT 6 Oscillator0 R CCT 7 Ext Mon I/P L CCT 8 Ext Mon I/P R CCT 9 Stud Spkr L CCT 10 Stud Spkr R CCT 11 PH1L Studio CCT 12 PH1R Studio CCT 13 T/B to opt 1 CCT 14 T/B to opt 2 CCT15 Ext 1L CCT16 Ext 1R CCT17 Ext 2L CCT18 Ext 2R CCT19 Ext 3L CCT20 Ext 3R CCT21 Ext 4L CCT22 Ext 4R CCT 23 PH2L Guest CCT 24 PH2R Guest EDAC 2 Circuit Number Function CCT 1 Mono 2 CCT 2 Aux 2 CCT 3 Aux 4 CCT 4 Aux 6 CCT 5 Aux 8 L CCT 6 Aux 8 R CCT 7 Ext 5L CCT 8 Ext 5R CCT 9 Ext 6L CCT 10 Ext 6R CCT 11 Ext 7L CCT 12 Ext 7R CCT13 RTN T/B CCT14 T/B Line Output CCT 15 ST1L CCT 16 ST1R CCT 17 Mono 1 CCT 18 Aux 1 CCT 19 Aux 3 CCT 20 Aux 5 CCT 21 Aux 7L CCT 22 Aux 7R CCT 23 Ext 8L CCT 24 Ext 8R B800 Installation 2.5

14 5HDU&RQQHFWRU3DQHO'W\SH&RQQHFWRUV There are a number of 25-way D-type female connectors (depending upon the number of input channels) on the rear connector panel. The diagram below shows a typical view of those which are located at the bottom edge of the rear connector panel. GRP5-8 CH25-28 CH17-20 CH9-12 CH1-4 ST1 & ST2 GRP1-4 CH21-24 CH13-16 CH5-8 The diagram below shows the pin labelling (as viewed from the outside of the console) The pin-outs of the various D-types are given below. Remote 25-way D-types Pin Function Pin Function Channel 4 (8) (12) (16) (20) (24) (28) (GRP4) (GRP8) 1 EXT MUTE (active low) 14 VCA CTL (0V=0dB, 5V= - ) 2 STOP #2(n/o relay contact) 15 STOP#1(n/o relay contact) 3 REMOTE START#2 (n/o relay contact) 16 REMOTE START#1(n/o relay contact) Channel 3 (7) (11) (15) (19) (23) (27) (GRP3) (GRP7) 4 EXT MUTE 17 VCA CTL 5 STOP#2(n/o relay contact) 18 STOP #1(n/o relay contact) 6 REMOTE START#2 (n/o relay contact) 19 REMOTE START#1(n/o relay contact) Channel 2 (6) (10) (14) (18) (22) (26) (GRP2) (GRP6) (ST2) 7 EXT MUTE 20 VCA CTL 8 STOP #2(n/o relay contact) 21 STOP #1(n/o relay contact) 9 REMOTE START #2(n/o relay contact) 22 REMOTE START#1(n/o relay contact) Channel 1 (5) (9) (13) (17) (21) (25) (GRP1) (GRP5) (ST1) 10 EXT MUTE 23 VCA CTL 11 STOP #2(n/o relay contact) 24 STOP #1(n/o relay contact) 12 REMOTE START #2(n/o relay contact) 25 REMOTE START #1(n/o relay contact) 13 not used Notes: GRP & ST Master modules do not utilise the "stop" function. The remaining 2 sections of the ST1& ST2 connector are not connected. Ground Ref. for EXT MUTE and VCA CTL is on EXT LOGIC D-type connector. 2.6 B800 Installation

15 EXT LOGIC Pin Function Pin Function 1 GND 14 GND 2 GND 15 Prod T/B Stud CTL 3 Prod T/B to Ext CTL (I/P) 16 Mic Open (active low ) 4 Prod T/B to Eng CTL (I/P) 17 Talk to Ext CTL O/P 5 Option 2 - CTL #2 / CF2 18 Option 2 - CTL #1 / CF2 6 Option 1 - CTL #2 / CF1 19 Option 1 - CTL #1 / CF1 7 On-Air o/p # 20 On-Air O/P #2 8 On-Air i/p #1 21 On-Air I/P #2 9 Not Used 22 Not Used 10 Ext Mntr (Level CTL I/P) 23 Ext CUE (Level CTL I/P) 11 RET T/B CTL (I/P) 24 Ext A/B CTL R (I/P) 12 Ext A/B CTL L (I/P) 25 Ext mute R (I/P) 13 Ext mute L (I/P) METERBRIDGE This connects via a ribbon cable to the Monitor/Comms D-type on the meterbridge. 1 ST1Left 14 ST1Right 2 ST2Left 15 ST2Right 3 MONO1 16 MONO2 4 Not used 17 Not used 5 Not used 18 Not used 6 Not Used 19 GND 7 Not Used 20 TB Mic +1V5 8 Studio Right 21 Studio Left 9 Ext VCA Warning LED 22 Monitor Left 10 Monitor Right 23 O/Press Signal 11 O/Press Ctl 24 Squawk Feed 12 Cue Meter Right 25 Cue Left 13 Cue Ctl B800 Installation 2.7

16 -XPSHU2SWLRQV MONO INPUT * = DEFAULT Note:Internal switch SW22 and Links 1 to 4 operate in conjunction with each other. SW22 Released = Insert Point is Pre-fade (see links 1 to 4) Depressed= Insert Point is Post-fade (links 1 to 4 have no effect, but they must be present) LK1-4 Pre-fade Insert 1-2 = Pre Eq, 2-3 = Post Eq* J1 Fit for VCA Option J2 VCA GND 1-2 = Local * 2-3 Master 0V J3 Remote Start 1-2 Pulse start/stop * 2-3 latched on-off J4 Remote Start SW 1-2. Omit Diode D10* fit 2-3 for no REMOTE START SW J5 Remote Start 1-2 = Start pulses only. SW Function 2-3 = Latching start/stop * J6 * Omit for meter cal J7 Stereo Auxes 1-2 Pre-mute* 2-3 Post-mute J8 Mono Auxes 1-2 Pre Mute 2-3 Post Mute * J9 Slate/Cleanfeed 1-2 makes these mutually exclusive. 2-3 interactive* J10 Meter feed J11 Remote Common J12 Signalisation J13 Signalisation J14 Meter Feed J15 Direct Output J16 Remote Start 1-2 Pre EQ 2-3 Pre Fade (post mute)* 1-2 Remote. 2-3 Local * 1-2 Monitor Dim. 2-3 Studio Mute* 1-2 Line Input only. 2-3 Mic Input only* 1-2 Meter Feed is Aux1 to Direct O/P 2-3 Meter follows J10 setting 1-2 Direct O/P is PRE Mute 2-3 Direct O/P is AFL 1-2 Remote Start is active only in LINE mode 2-3 Remote Start is active only in MIC 2.8 B800 Installation

17 MONO GRP J1 Rem Com A = local * 3 pin B = rem com J2 FIT = t/b replaces prog ( to grp o/p )* 2 pin OMIT = t/b mix with prog J3 FIT = slate replaces prog* 2 pin OMIT = slate mix with prog J4 A = On Air does not kill T/B to GRP O/P * 3 pin B = On Air kills T/B to GRP O/P J5 A= Limiter Affects St feed & GRP to GRP routing 3 pin B= Limiter Bypass for St ETC limit on GRP O/P only * J6 FIT = Pre-emphasis on limit side chain * 2 pin omit = no pre-emphasis) J7 Mono aux A = Pre mute 3 pin B = post mute* J8 St Aux 7/8 A = Pre mute* 3 pin B = Post mute J9 - J13 Not Used S30 = INT Insert Pre/post SW *= Pre-Fade STEREO GRP J1 Rem Com 1-2 = local * 3 pin 2-3 = rem com J2 FIT = t/b replaces prog ( to grp o/p )* 2 pin OMIT = t/b mix with prog J3 FIT = slate replaces prog* 2 pin OMIT = slate mix with prog J4 1-2 = On Air does not kill T/B to GRP O/P * 3 pin 2-3 = On Air kills T/B to GRP O/P J5 Left 1-2= Limiter Affects St feed & GRP to GRP routing 3 pin 2-3= Limiter Bypass for St ETC limit on GRP O/P only* J7 Right 1-2= Pre mute 3 pin 2-3 = post mute* J9, J10 St Aux 7/8 1-2 = Pre fader 3 pin 2-3= Pre mute J11, J12 Mono sum 1-2 =Pre fader for Aux =Pre Mute J13 to J17 Not Used B800 Installation 2.9

18 Note:Internal switches SW27 & SW28 and Links 1 to 8 operate in conjunction with each other. SW27 Released = Insert Point is Pre-fade (see links 1 to 8) & SW28 Depressed = Insert Point is Post-fade (links 1 to 8 have no effect, but they must be present) LK1-8 Pre-fade Insert 1-2 = Pre Eq, 2-3 = Post Eq* LK9 &10 set the input to the meter rectifier. Pre-EQ 1-2 Pre-fader 2-3 * J7 & J8 set the mono pre feed to the auxes Pre-mute 1-2* Pre-fade 2-3 The following jumpers are on the sub-pcb. J3 REM START 1-2 Pulse start/stop * 2-3 latched on-off J4 REM SW 1-2. Omit Diode D45 * fit 2-3 for no REM SW J5 REM SW FUNC 1-2 = Start pulses only. 2-3 = Latching start/stop * J11 REM COM J12 Signalisation J10 Signalisation 1-2 Remote. 2-3 local * 1-2 Monitor Dim. 2-3 Studio Mute* 1-2 Line Input only. 2-3 Mic Input only* STEREO MASTER J1 Rem Com 3 pin A= Local * B = REM J2 - J3 Not Used J4 2 pin Fit = T/B Replace prog * Omit = T/B Mix Prog J5 & J6 Fit = Limiter pre-emphasis Omit = No pre emphasis * Option Single VCA Ctl fader (only) or Stereo Audio fader or 2 Mono faders B800 Installation

19 MONITOR MODULE J1 1-2 * 2-3 Ext 8 Input is -10dBV sensitivity J2/J3/J4 1-2 * Cue to Monitor 2-3 Talk to Studio (used with used with 2 monitor modules as C/room /Studio) J5/J6/J7/J8/J9 1-2 * 2-3 Prod T/B to Studio (used with used with 2 monitor modules as C/room /Studio) J10 & J11 If the Q Speaker Outputs are not being used, link J10 pins 1 to 2, and link J11 pins 1 to 2. In this configuration, a sum of the Cue Left and Right Signals are routed to the Cue Speaker on the Overbridge. This feed is muted by using the Overpress facility (if it is fitted). If the Q Speaker Outputs are being used, link J10 pin1 to J11 pin1, and link J10 pin 2 to J11 pin 2. In this configuration the sum of the Cue Left and Cue Right signals is never routed to the Cue Speaker on the Overbridge. The individual Cue Left and Cue Right signals are routed to their respective Cue Speaker Outputs, but these are muted by using the Overpress facility (if it is fitted). Alternatively if only pins J10 pin2 and J11 pin 2 are linked then the Overpress facility will not mute the Cue L & R signals to the Cue Speaker Outputs. J * Cue mixes with H/phone prog 2-3 Cue replaces H/phone prog J13 1-2* for monitor dim by DIM bus 2-3 for monitor mute by dim bus J * Studio Mute 2-3 fit for use as a Studio Monitor Module Dim range is adjustable from 0 to -30dB by preset pot VR7. COMMS MODULE J1 & J2 1 & 2 linked on both jumpers Signal from EXT CUE on Comms Module EDAC are routed by released OPT 1 And OPT 2 switches to the T/B to OPT1 and the T/B to OPT2 outputs on the Comms Module EDAC Pins 2 & 3 linked on both jumpers = EXT CUE signal not routed. J3 T/B to Studio Speakers 1-2 * Mute kills T/B to Spkrs 2-3 T/B overrides Mute J4 1-2 * T/B mixes with prog 2-3 T/B replaces prog (& Prod T/B) J5 & fitted * T/B line input level is set by preset VR8 Dim range is adjustable from 0 to -30dB by preset VR15 B800 Installation 2.11

20 ,QWHUQDO0RQLWRU6RXUFH6HOHFWLRQ The DESK A bank of switches, on the Monitor Module, allows you to select 1 of 6 internal signals as the internal monitor source. The 6 are selected via the scramble card (SC3556) in the console. The appropriate section of this PCB s silk screen is reproduced below. The six signals may be chosen from the following list: Group 1 to Group 8 ( Group 1 togroup 4 L + R for Sterero Group ) The Main Stereo Mixes of the ST1 and the ST2 Modules The Mono Mixes of the ST1 and the ST2 Modules Aux1 to Aux8. There is also a spare left and spare right feed which may be used to monitor any suitable point in the console. Fitting Links Suitably sized hair-pin links may be soldered into the appropriate through-plated holes. Take care to select the correct side when connecting a stereo pair. For example, if you wanted to assign Source 1 to Aux 6 then you would fit links L20 and L46. If you then wanted to assign Source 2 to Aux 7 (which is a stereo pair) then you would fit links L73 and L100. The factory default setting is: Left Right Source 1 ST1 L ST1 R Source 2 ST2 L ST2 R Source 3 GP1 / ( GP1L ) GP2 / ( GP1R ) Source 4 GP3 / ( GP2L ) GP4 / ( GP2R ) Source 5 GP5 / ( GP3L ) GP6 / ( GP3R ) Source 6 GP7 / ( GP4L ) GP8 / ( GP4R ) 2.12 B800 Installation

21 3. Block Diagrams B800 Block Diagrams 3.1

22 0RQR,QSXW%ORFN'LDJUDP 48V Mic LINE Option -60dBu TONE GAIN PHASE TRIM HPF Hi-Q Hi-Q Line Pad * 4-Band, Semi-Parametric EQ HF MF2 MF1 LF EQ Cut/Boost Cut/Boost Centre Freq. Centre Freq. REMOTE START REMOTE STOP RELAY CONTROL LOGIC ON STUDIO MUTE MONITOR DIM REM COM LED METER INS INSERT SEND PEAK 3-INPUT PEAK DETECT Note: the Insert Point may be configured to be in one of two other places which are marked thus - * INSERT RETURN EXT MUTE CTL MUTE FADER DOWN FADER VCA OPTION OVER- PRESS OPTION * PAN L R PAN to groups ODD GROUPS STEREO ROUTES EVEN GROUPS GRP L ST1 R L ST2 R GRP EXT VCA CTL VCA GRPS 1-4 CLEANFEED MIXES DIRECT OUTPUT ROUTING CONTROL DIRECT OUTPUT CLEANFEED T/B AUX1 POT MAY BE SWITCHED TO CONTROL DIRECT OUTPUT METER PROD T/B PROD T/B CTL TALK BUS SLATE TALK/TONE SLATE CTL ON-AIR CTL CUE AFL/PFL CONTROL CLEANFEED #1 CLEANFEED #2 CLN1 RTN CLN2 RTN CUE L CUE R OVERPRESS OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL PRE AUX1 POT MAY BE SWITCHED TO CONTROL DIRECT OUTPUT AUX1 AUX2 PRE AUX3 AUX4 AUX5 & 6 CIRCUIT IS IDENTICAL TO AUX3 & 4 AUX5 AUX6 PRE LEVEL PAN AUX7 LEFT AUX7 RIGHT AUX8 LEFT AUX8 RIGHT STEREO AUX8 CIRCUIT IS IDENTICAL TO AUX7 3.2 B800 Block Diagrams

23 6WHUHR,QSXW%ORFN'LDJUDP LEFT INPUT LINE Option -60dBu TONE GAIN M/S MONO R 48V Pad HIGH- PASS FILTER LOW- PASS FILTER RIGHT INPUT Pad Option MONO L RHS PHASE HIGH- PASS FILTER LOW- PASS FILTER REMOTE START REMOTE STOP PEAK LED METER 2 x 4-INPUT PEAK DETECT RELAY CONTROL LOGIC STUDIO MUTE MONITOR DIM ON REM COM PAN TRIM TRIM * T0 PEAK DETECT CIRCUIT 4-Band, Semi-Parametric EQ HF MF2 MF1 LF 4-Band, Semi-Parametric EQ HF MF2 MF1 LF * T0 PEAK DETECT CIRCUIT BAL / PAN MUTE T0 Cut/Boost PEAK DETECT CIRCUIT Centre Freq. FADER EQ T0 PEAK DETECT CIRCUIT T0 PEAK * INS T0 PEAK DETECT CIRCUIT Note: the Insert Points may each be configured to be in one of two other places which are marked thus - T0 PEAK DETECT CIRCUIT DETECT CIRCUIT * INSERT SEND L INSERT RETURN L INSERT SEND R INSERT RETURN R PAN BAL / PAN IMAGE WIDTH CONTROL CIRCUIT EXT MUTE CTL MUTE MUTE FADER DOWN VCA OPTION VCA OPTION OVER- PRESS OPTION VCA CONTROL EXT VCA CTL * T0 PEAK DETECT CIRCUIT VCA GRPS 1-4 STEREO ROUTES LEFT FEEDS ODD GRPS, RIGHT FEEDS EVEN GRPS L ST1 R L ST2 R GRP METER CUE AFL/PFL CONTROL CUE L CUE R OVERPRESS OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL CLEANFEED MIXES CLEANFEED T/B DIRECT OUTPUT ROUTING CONTROL DIRECT OUTPUT L (VIA EDAC) DIRECT OUTPUT R (VIA EDAC) METER PROD T/B PROD T/B CTL TALK BUS SLATE TALK/TONE SLATE CTL ON-AIR CTL CLEANFEED #1 CLEANFEED #2 CLN1 RTN CLN2 RTN PRE PRE LEVEL PAN AUX7 LEFT AUX1 AUX2 STEREO AUX8 CIRCUIT IS IDENTICAL TO AUX7 AUX7 RIGHT AUX8 LEFT AUX8 RIGHT AUX3 & 4 AND AUX5 & 6 CIRCUITS ARE IDENTICAL TO AUX1 & 2 AUX3 AUX4 AUX5 AUX6 B800 Block Diagrams 3.3

24 *URXS0RGXOH%ORFN'LDJUDP NOTE: the Group Mix carries one of the 8 group mixes, depending upon its position in the console. GROUP MIX LEFT STEREO TAPE RETURN RIGHT MONO SOURCE BUS AS INPUT LEVEL PAN MUTE CUE (St. Ret) GRP Note: the Insert Point may be configured to be in an alternative place which is marked thus - * INS INSERT SEND INSERT RETURN REMOTE START RELAY CONTROL LOGIC REM COM EXT MUTE CTL EXT VCA CTL MUTE FADER FADER DOWN OVER- PRESS OPTION VCA OPTION * LIMITER LIMITER IN GROUP OUTPUT ROUTING CONTROL TALK BUS SLATE TALK/TONE TO MONITOR & M/BRIDGE GROUP OUTPUT PROD T/B CTL SLATE GRP ENBL ON-AIR CTL ROUTING TO MAIN STEREO MIXES PAN L ST1 LEFT ST1 RIGHT ST2 LEFT ST2 RIGHT R The pan left signal is routed to odd-numbered groups, and the pan right signal is routed to evennumbered groups. ROUTING TO GROUP BUSSES GP1 GP2 GP3 GP4 GP5 GP6 GP7 GP8 NOTE: one of these feeds to the Group Mix busses will be broken to prevent a group from being routed to itself. The position of the module determines which feed is not connected. CUE (Group) AFL/PFL CONTROL CUE L CUE R OVERPRESS OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL PRE 2 AUX1 AUX2 AUX3 AUX4 PRE AUX5 AUX6 AUX3 &4, AND AUX5 & 6 CIRCUITS ARE IDENTICAL TO AUX1 & 2 8 AUX7 LEFT AUX7 RIGHT AUX8 LEFT AUX8 RIGHT 3.4 B800 Block Diagrams

25 6WHUHR*URXS0RGXOH%ORFN'LDJUDP BUS AS INPUT NOTE: each Group Mix carries one of the 8 group mixes, depending upon its position in the console. GROUP MIX (ODD) GROUP MIX (EVEN) LEFT STEREO TAPE RETURN RIGHT MONO SOURCE LEVEL BAL MUTE GRP BAL/PAN STEREO WIDTH CONTROL INS INSERT SEND LEFT INSERT RETURN REMOTE START RELAY CONTROL LOGIC SIGNAL DETECT PEAK DETECT INSERT SEND RIGHT INSERT RETURN MUTE REM COM EXT MUTE CTL EXT VCA CTL MUTE MUTE FADER FADER DOWN OVER- PRESS OPTION VCA OPTION VCA OPTION * * LIMITER LIMITER LIMITER IN GROUP OUTPUT ROUTING CONTROL LEFT GROUP OUTPUT TO MONITOR & M/BRIDGE RIGHT GROUP OUTPUT PROD T/B CTL SLATE GRP ENBL ON-AIR CTL Note: the Insert Points may be configured to be in alternative places which are marked thus - * ROUTING TO MAIN STEREO MIXES TALK BUS SLATE TALK/TONE ST1 LEFT ST1 RIGHT ST2 LEFT ST2 RIGHT ROUTING TO GROUP BUSSES GP1 GP2 GP3 GP4 GP5 GP6 GP7 GP8 NOTE: a pair of these feeds to the Group Mix busses will be broken to prevent any group from being routed to itself. The position of the module determines which feeds are not connected. AFL/PFL CONTROL CUE L CUE R OVERPRESS CUE (Group) CUE (STER. RET) OVERPRESS CTL CUE CTL CUE CLEAR PFL/AFL CTL 2 AUX1 PRE AUX2 AUX 3 & 4, AND AUX 5 & 6 CIRCUITS ARE IDENTICAL TO AUX 1 & 2 8 AUX3 AUX4 AUX5 AUX6 AUX7 LEFT PRE AUX7 RIGHT AUX8 LEFT AUX8 RIGHT B800 Block Diagrams 3.5

26 67670DVWHU%ORFNGLDJUDP ST1 MASTER ONLY ST1 (or2) L MIX POWER SUPPLY VOLTAGE MONITOR FADER MUTE INSERT SEND ON-AIR FADER DOWN INS VCA OPTION MUTE INSERT RETURN ON-AIR RELAY CONTACTS ON-AIR EXT CTL VCA CTL REMOTE START OPTO- ISOLATOR ON-AIR CONTROL LOGIC RELAY CONTROL LOGIC PEAK DETECT FADER DOWN FADER LIMITER PRE MUTE LIMITER IN MONO LEVEL OUTPUT ROUTING CONTROL INS MUTE TO MONITOR & METERBRIDGE ST1 (or 2) LEFT OUTPUT TALK ST1 (or ST2) TONE ST1 (ST1 ONLY) TONE ST1 CTL TB1 CTL (or TB2 CTL) ON-AIR CTL REM COM MONO OUTPUT (EDAC CONNECTOR) TO MONITOR & METERBRIDGE EXT MUTE INSERT SEND VCA OPTION INSERT RETURN LIMITER LIMITER IN OUTPUT ROUTING CONTROL TO MONITOR & METERBRIDGE ST1 (or 2) RIGHT OUTPUT ST1 (or2) R MIX AUX 1 (or2) MIX AUX1(or 2) MASTER LEVEL MUTE TO METERBRIDGE AUX1 (2) OUTPUT (EDAC CONNECTOR) CUE L PFL CUE R CUE CTL AUX3 (4), AND AUX5 (6) CIRCUITS ARE IDENTICAL TO AUX1 (2) AUX 7 (8) R MIX AUX 7 (8) L MIX AUX 7 (or 8) MASTER LEVEL MUTE TO METERBRIDGE AUX 7 (8) L OUTPUT (EDAC CONNECTOR) CUE L PFL CUE CTL TO METERBRIDGE AUX 7 (8) R OUTPUT (EDAC CONNECTOR) CUE R 3.6 B800 Block Diagrams

27 0RQLWRU%ORFN'LDJUDP GROUP1 REM A/B L REM A/B R 8 BALANCED EXTERNAL B L INPUTS 8 BALANCED EXTERNAL B R INPUTS LHS SELECT INT A RHS SELECT LHS SELECT EXT B RHS SELECT SOURCE A/B M/S DECODE (OPTION) 6 STEREO PAIRS MONO R MONO L RHS PHASE 6 INPUTS SELECTED VIA THE SCRAMBLE CARD GROUP 8 ST1 STEREO MIX ST2 STEREO MIX ST1 MONO MIX ST2 MONO MIX SPARE AUX 1 TO AUX 8 GROUP MASTER VCA OPTION GROUP 1 MASTER VCA FADER GROUP 2 MASTER VCA FADER VCA BUS 1 VCA BUS 2 RET T/B OVERPRESS MIX BUS RET T/B CTL TO METERBRIDGE SPEAKER AMP CUE METER L PROD T/B TO ENG PROD T/B TO ENG CTL OVERPRESS CTL EXT CUE LEVEL CTL CUE MNTR LEVEL AFL VCA CTL AFL ADJUST VCA VCA CUE METER R CUE TO MON PHONES LEVEL CUE L BUS CUE R BUS PFL/AFL CTL CUE Q SPKR L CUE Q SPKR R ENGINEER S PHONES HP SPLIT CUE CTL MON METER L VCA ALT MON SPKR 1 LEFT MONO MON SPKR 2 LEFT MUTE R MUTE L MON METER R VCA MON SPKR 1 RIGHT EXT MUTE L EXT MUTE R EXT LEVEL CONTROL MUTE MUTE LEVEL BAL VCA CTL VCA CTL MON SPKR 2 RIGHT DIM DIM ADJUST MNTR DIM ON-AIR CTL EXT DIM STUDIO MUTE CLEAR CUE CLEAR CTL B800 Block Diagrams 3.7

28 &RPPV%ORFN'LDJUDP 3.8 B800 Block Diagrams

29 4. Functional Description B800 Functional Description 4.1

30 0RQR,QSXW0RGXOH Input 1 The 48V switch applies 48V Phantom power to the MIC I/P XLR on the rear connector panel. The switch illuminates to indicate that it is switched on. 2 The TONE switch applies a -60dBu signal to the module s pre-amplifier circuit. This allows you to check the operation of the module. The switch illuminates to indicate that it is switched on. 3 The LINE switch, when active, selects the LINE I/P XLR as the module s signal source instead of the MIC I/P XLR. The switch illuminates to indicate that it is switched on. 4 The multi-position GAIN switch selects the gain in 6dB steps. When the MIC I/P is selected the gain may be set from 6dB to 72 db. When the LINE I/P is selected the gain may be set from -12dB to 54dB. 5 The TRIM pot allows you to adjust the gain by +/- 6dB. In conjunction with the GAIN switch this allows you to adjust the overall gain to any desired figure within the available range. 6 The Phase of the input signal may be inverted by use of the ( phase) switch. The switch illuminates to indicate that it is switched on The High-Pass Filter is selected by depressing its switch. The switch illuminates to indicate that it is switched on. The filter has a slope of 18dB/Octave and a cut-off point of 100Hz Equaliser The Equaliser is a 4-band semi-parametric design. 8 The inner knob of the dual-concentric HF pot allows you to cut or boost the HF shelving filter by up to 15dB. The Cut-off frequency is sweepable, using the inner knob, between 1kHz and 16kHz. 9 The inner knob of the dual-concentric MF2 pot allows you to cut or boost the High Mid-Range bell-response filter by up to 15dB. The Mid-point frequency is sweepable, using the inner knob, between 500Hz and 8kHz. The Q-factor of the filter is switchable between 1.2 and 2.3, via the associated HI-Q button. 10 The inner knob of the dual-concentric MF1 pot allows you to cut or boost the Low Mid-Range bell-response filter by up to 15dB. The Mid-point frequency is sweepable, using the inner knob, between 125Hz and 2kHz. The Q-factor of the filter is switchable between 1.2 and 2.3, via the associated HI-Q button. 11 The inner knob of the dual-concentric LF pot allows you to cut or boost the LF shelving filter by up to 15dB. The Cut-off frequency is sweepable, using the inner knob, between 32Hz and 500Hz. 12 The EQ section may be switched in and out of circuit via the EQ switch. The switch illuminates to indicate that it is switched in. 4.2 B800 Functional Description

31 Insert Point 13 When the INS (Insert) button is depressed, the signal path is routed via the insert return XLR. When the INS button is released the signal path is routed internally. Note that the signal is always available on the insert send XLR, irrespective of the position of the INS switch. The Insert Point may be configured to be pre, post-eq or post-fade, via an internal pcb-mounted switch and jumpers. Auxiliary Sends 14 Aux7 and Aux8 are both Stereo Pairs. The dual-concentric pots control the level and also act as a pan control to position the signal within the stereo image. The sends may be configured, via the appropriate PRE switch, as pre or post-fade. 15 Aux1 to Aux6 are controlled by 3 pairs of dual-concentric pots. They are also switchable pre or post-fade in pairs by the appropriate PRE switches. 16 The DIR O/P / AUX1 switch switches the Aux1 level pot into the direct output circuit; at the same time the Aux1 Output is fed with its full pre-level-control signal. This pot will control the post-fade channel signal, mor the cleanfeed output level when selected. 15 Pan 17 The Pan pot allows the input signal to be positioned within the stereo image of the main mix. The PAN switch, when depressed, routes the Left signal to odd-numbered Groups, and the Right signal to even-numbered groups. When the PAN switch is released the pre-pan signal is sent to all groups Mute The Mute section is located immediately after the high-pass filter. 18 The Mute may be activated by the MUTE switch (note that the channel ident number is printed on the switch), or by the remote mute signal which is presented on the 25-way d-type connector on the rear connector panel. The associated LED glows to indicate that the remote mute is active. Fader 19 The Fader is placed immediately after the Mute Section. It gives 10dB of gain at its maximum setting. 25 VCA Control (option) 20 The control of the module s output level may be switched to allow the VCA Group Master Faders (which are located on the Monitor and Comms Modules) to B800 Functional Description 4.3

32 add, or subtract, an offset to the level set by the module s fader: this is done by use of the VCA GRP 1, 2, 3 & 4 switches Output Routing 21 The module s output may be routed to any or all of the 8 group busses ( via the 1 to 8 switches), and or one or both of the ST1 and ST2 stereo master busses. Direct Output The Direct Output XLR on the rear connector panel normally carries the channel s direct output, or may be replaced by the following signals: a cleanfeed output ( see next below) talkback from the overbridge mic XLR oscillator and slate oscillator output Cleanfeed 22 There are two cleanfeed busses in the console: the cleanfeed1 bus and the cleanfeed2 bus. The cleanfeed1 bus carries a mono mix of the ST1 Master mix. To provide a mix-minus signal at the direct output XLR using the ST1 mix, you must depress the ST1 button and the CLEANFEED button. If the CLEANFEED button is depressed and the ST1 button is released, the cleanfeed2 bus is used as the source of the mix-minus signal. The cleanfeed2 bus carries a mix from all the input modules which have only their CLEANFEED buttons but not their ST1 buttons depressed. Talkback 23 If the T/B switch is depressed the talkback signal from the overbridge mic XLR is switched to the Direct Output. Cue System 24 The cue system is activated by pressing the CUE button. The CUE button may be operated in latched or momentary mode, depending upon how long you hold it down for. If you press and release within approximately 0.5 seconds the button will latch. If, on the other hand you press and hold for more than 0.5 seconds then the cue will not latch. Note that there are some interlocks associated with the cue system. They are as follows: When the cue switch is active, and the fader is in its fully-down position, the PFL signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master setting on the Monitor Module. The CUE button may be reset by moving the fader away from the fully-down position. Note that if the cue button is pressed when the fader is already away from the fully-down position the afl/pfl signal will be selected according to the position of the AFL/PFL master switch on the monitor module. 4.4 B800 Functional Description

33 Remote Start/Stop Two sets of relay contacts to start/stop external machines are available on the rear connector panel d-type connector. These may be set to latching or pulsed operation via internal jumpers. Note that these relays only operate when Line Input is selected on the module. Under no circumstances should mains voltages be placed on these contacts. 25 The ON switch works in conjunction with the fader s microswitch. The LED in the ON switch will illuminate at half brightness if the fader is fully down when the On button is pushed: this indicates that the remote start is armed. When the fader is moved away from the fully-down position the start relay will be activated and the LED in the ON switch will glow at full brightness. Alternatively, if the fader is moved away from the fully-down position before the ON button is pushed, the relay will operate as soon as the ON switch is pushed. Meter 26 The 8-segment LED meter may be set to pre-fade (post Mute) or pre-eq by an internal jumper. 27 The 3-input Peak LED monitors pre-eq, post-eq and post-fade. If any of these points rises to 6dB below clipping the LED will illuminate B800 Functional Description 4.5

34 Rear Connector Panel The diagram on the left of this page is a copy of the appropriate section of the key to connector functions which is printed on one of the overbridge rear panels. This key applies to all those rear connector panels which are connected to mono input modules. Direct Output Pin1 Ground Pin2 Hot Pin3 Cold Insert Send Pin1 Pin2 Pin3 Ground Hot Cold Insert Return Pin1 Ground Pin2 Hot Pin3 Cold Line Input Pin1 Pin2 Pin3 Mic Input Pin1 Pin2 Pin3 Ground Hot Cold Ground Hot Cold 4.6 B800 Functional Description

35 B800 Functional Description 4.7

36 6WHUHR,QSXW Input 1 The 48V switch applies 48V Phantom power to the I/P XLRs on the rear connector panel. The switch illuminates to indicate that it is switched on. Note that phantom power is only applied to the I/P XLRs when Mic is selected. 2 The TONE switch applies a -60dBu signal to the module s pre-amplifier circuit. This allows you to check the operation of the module. The switch illuminates to indicate that it is switched on. 3 The LINE switch, when active, routes the I/P XLRs signals via an attenuator. The switch illuminates to indicate that it is switched on. Phantom power is not available if LINE is selected. 4 The multi-position GAIN switch selects the gain in 6dB steps. When the MIC I/P is selected the gain may be set from 6dB to 72 db. When the LINE I/P is selected the gain may be set from -12dB to 54dB. 5 The M/S switch provides M/S decoding in the event that M/S microphones are being used as the signal source. 6 When the L and the R switches are both released the stereo pairs of the sources are routed normally. However if the L switch is depressed then the left signal is fed to both sides of the monitor circuit. Similarly the right signal is routed to both sides if the R. If both switches are depressed then a mix of left and right is fed to both sides of the monitor. 7 The Phase of the right-hand input signal may be inverted by use of therhs ( phase) switch. The switch illuminates to indicate that it is switched on. 8 The High-Pass Filter is selected by depressing its switch. The switch illuminates to indicate that it is switched on. The filter has a slope of 18dB/Octave and a cut-off point of 100Hz. 9 The Low-Pass Filter is selected by depressing its switch. The switch illuminates to indicate that it is switched on. The filter has a slope of 12dB/Octave and a cut-off point of 12kHz. 10 The TRIM pot allows you to adjust the gain by +/- 6dB. In conjunction with the GAIN switch this allows you to adjust the overall gain to any desired figure within the available range. Equaliser The Equaliser is a 4-band semi-parametric design. 11 The inner knob of the dual-concentric HF pot allows you to cut or boost the HF shelving filter by up to 15dB. The Cut-off frequency is sweepable, using the inner knob, between 1kHz and 16kHz. 12 The inner knob of the dual-concentric MF2 pot allows you to cut or boost the High Mid-Range bell-response filter by up to 15dB. The Mid-point frequency 4.8 B800 Functional Description

37 is sweepable, using the inner knob, between 500Hz and 8kHz. The Q-factor of the filter is switchable between 1.2 and 2.3, via the associated HI-Q button. 13 The inner knob of the dual-concentric MF1 pot allows you to cut or boost the Low Mid-Range bell-response filter by up to 15dB. The Mid-point frequency is sweepable, using the inner knob, between 125Hz and 2kHz. The Q-factor of the filter is switchable between 1.2 and 2.3, via the associated HI-Q button. 14 The inner knob of the dual-concentric LF pot allows you to cut or boost the LF shelving filter by up to 15dB. The Cut-off frequency is sweepable, using the inner knob, between 32Hz and 500Hz. 15 The EQ section may be switched in and out of circuit via the EQ switch. The switch illuminates to indicate that it is switched in. Insert Point 16 When the INS (Insert) button is depressed, the signal path is routed via the insert return XLRs. When the INS button is released the signal path is routed internally. Note that the signal is always available on the insert send XLRs, irrespective of the position of the INS switch. The Insert Point may be configured to be pre, post-eq or post-fade via an internal pcb-mounted switch and jumpers. Auxiliary Sends 17 Aux7 and Aux8 are both Stereo Pairs. The dual-concentric pots control the level and also act as a balance control to adjust the stereo image. The sends may be configured, via the appropriate PRE switch, as pre or post-fade. 18 Aux1 to Aux6 are controlled by 3 pairs of dual-concentric pots. They are also switchable pre or post-fade in pairs by the appropriate PRE switches Pan 19 The BAL/PAN pot allows the input signal to be positioned within the stereo image of the main mix. The PAN switch, when depressed, causes the BAL/PAN pot to pan the signal, i.e. the left or right signal may be infinitely attenuated by panning hard right or hard left, this also applies +3dB of gain to the opposite signal; the centre applies 0dB of gain to both signals. When the PAN switch is released the BAL/PAN pot will balance the stereo signal, i.e. the centre position gives 0dB gain to both left and right whilst hard left or hard right provides +3dB and -10dB to the appropriate signals. 20 The IMAGE WIDTH Control allows the stereo image to be varied from Mono, through normal Stereo, to Wide Stereo Mute The Mute section is located immediately after the Image Width Control. 21 The Mute may be activated by the MUTE switch (note that the channel ident number is printed on the switch), or by the remote mute signal which is presented B800 Functional Description 4.9

38 on the 25-way d-type connector on the rear connector panel. The associated LED glows to indicate that the remote mute is active Fader 22 The Fader is placed immediately after the Mute Section. It gives 10dB of gain at its maximum setting. VCA Control (option) 23 The control of the module s output level may be switched to allow the VCA Group Master Faders (which are located on the Monitor and Comms Modules) to add, or subtract, an offset to the level set by the module s fader: this is done by use of the VCA GRP 1, 2, 3 & 4 switches. Output Routing 24 The module s output may be routed to any or all of the 8 group busses ( via the 1-2, 3-4, 5-6 and 7-8 switches), and or one or both of the ST1 and ST2 stereo master busses. Direct Output (Optional) The Direct Output (via an optional EDAC on the rear connector panel) may also carry the following signals: a cleanfeed output ( see next below) talkback from the overbridge mic XLR oscillator and slate oscillator output Cleanfeed 25 There are two cleanfeed busses in the console: the cleanfeed1 bus and the cleanfeed2 bus. The cleanfeed1 bus carries a mono mix of the ST1 Master mix. To provide a mix-minus signal at the direct output XLR using the ST1 mix, you must depress the ST1 button and the CLEANFEED button. If the CLEANFEED button is depressed and the ST1 button is released, the cleanfeed2 bus is used as the source of the mix-minus signal. The cleanfeed2 bus carries a mix from all the input modules which have only their CLEANFEED buttons but not their ST1 buttons depressed. Talkback 26 If the T/B switch is depressed the talkback signal from the overbridge mic XLR is switched to the Direct Output. Cue System 27 The cue system is activated by pressing the CUE button. The CUE button may be operated in latched or momentary mode, depending upon how long you hold 4.10 B800 Functional Description

39 it down for. If you press and release within approximately 0.5 seconds the button will latch. If, on the other hand you press and hold for more than 0.5 seconds then the cue will not latch. Note that there are some interlocks associated with the cue system. They are as follows: When the cue switch is active, and the fader is in its fully-down position, the PFL signal will be put onto the Cue L & R busses irrespective of the AFL/PFL master setting on the Monitor Module. The CUE button may be reset by moving the fader away from the fully-down position. Note that if the cue button is pressed when the fader is already away from the fully-down position the afl/pfl signal will be selected according to the position of the AFL/PFL master switch on the monitor module. Remote Start/Stop Two sets of relay contacts to start/stop external machines are available on the rear connector panel d-type connector. These may be set to latching or pulsed operation via internal jumpers. Note that these relays only operate when Line Input is selected on the module. Under no circumstances should mains voltages be placed on these contacts. 28 The ON switch works in conjunction with the fader s microswitch. The LED in the ON switch will illuminate at half brightness if the fader is fully down when the On button is pushed: this indicates that the remote start is armed. When the fader is moved away from the fully-down position the start relay will be activated and the LED in the ON switch will glow at full brightness. Alternatively, if the fader is moved away from the fully-down position before the ON button is pushed, the relay will operate as soon as the ON switch is pushed. Meter 29 The 8-segment LED meter may be set to pre-fade (post Mute) or pre-eq by an internal jumper. 30 The 2 X 4-input Peak LED monitors pre-eq, post-eq, post-insert return and post-fade. If any of these points rises to 6dB below clipping the LED will illuminate B800 Functional Description 4.11

40 Rear Connector Panel The diagram on the left of this page is a copy of the appropriate section of the key to connector functions which is printed on one of the overbridge rear panels. This key applies to all those rear connector panels which are connected to stereo input modules. Insert Send Pin1 Pin2 Pin3 Ground Hot Cold Insert Return Pin1 Ground Pin2 Hot Pin3 Cold Input Pin1 Pin2 Pin3 Ground Hot Cold 4.12 B800 Functional Description

41 B800 Functional Description 4.13

42 RQR*URXS There are up to eight Mono Group Modules in the console. The Mono Group Module comprises a Group Master section and a Stereo Return section. Stereo Return Input The stereo return inputs are via two XLR sockets on the rear connector panel. 1 The Left and Right signals may be mixed to give a mono sum signal by depressing the MONO switch. 2 When the BUS switch is depressed the inputs to the stereo return circuit are disabled and are replaced by the group output signal itself. 3 The input sensitivity is controlled by the LEVEL pot The PAN pot acts as a Pan control only if MONO is depressed, or if BUS is depressed. If they are not, and therefore the Stereo XLRs are being used as a stereo pair, then the PAN pot acts as a Balance control with a gain of +3dB and a drop of -10dB at either end. 5 The post-pan signal is muted by the MUTE switch Output Routing 6 The post-mute stereo signal may then be routed by the appropriate switches to: the ST1 mix, the ST2 mix, and/or the GROUP for the module on which it is located. Note that the BUS and the GRP switch are interlocked: if you depress both then the BUS switch takes priority, disabling the GROUP switch. Cue System 7 When the CUE button is depressed either the pre-level-control signal or the post-mute signal, depending on the position of the PFL/AFL switch on the Monitor Module, is fed to the cue system. The CUE button may be operated in latched or momentary mode, depending upon how long you hold it down for. If you press and release within approximately 0.5 seconds the button will latch. If, on the other hand you press and hold for more than 0.5 seconds then the cue will not latch B800 Functional Description

43 18 Group Master Insert Point The Group Mix bus is fed to an internal switch (s30) which allows you to select the insert point as being pre or post-fade. The default factory setting is pre-fade. The Insert Send is via an XLR on the rear connector panel. 8 When the INS (Insert) button is depressed, the signal path is routed via the insert return XLR. When the INS button is released the signal path is routed internally. Note that the signal is always available on the insert send XLR, irrespective of the position of the INS switch. Mute Assuming that the Group Master is configured such that the Insert point is pre-fade, the post-insert -point signal is fed to the Mute circuit The Mute may be activated by the MUTE switch (note that the group number is printed on the switch), or by the remote mute signal which is presented on the 9-way d-type connector on the rear connector panel. The associated LED glows to indicate that the remote mute is active. Fader 10 The Fader is placed immediately after the Mute Section. It gives 10dB of gain at its maximum setting. A set of relay contacts to start an external machine is available on the rear connector panel d-type connector. These contacts close when the fader is away from the fully-down position. Under no circumstances should mains voltages be placed on these contacts. Limiter 11 The 4-position rotary THRESHOLD switch sets the signal level (in dbr) at which the limiter starts operating. 12 The 8-LED GAIN REDUCTION meter shows the extent to which the limiter is reducing the gain. 13 The FAST ATTACK switch gives a choice of attack times: 10msec when the switch is released, 0.5msec when the switch is depressed. 14 The RELEASE control allows you to select a limiter release time from 200msecs to 10secs. The AUTO switch gives a preset release time of one second with a 2-stage release action. B800 Functional Description 4.15

44 The Limiter may be linked to the next one on its right hand side by pressing the LINK button (on the Group number 8 master this has no effect). If limiters are linked any signal which causes one limiter to start acting will also cause the other linked limiters to act. 16 The LIMITER IN switch places the limiter in-circuit when it is depressed. Output Routing 17 The post-limiter signal is routed to the PAN pot. (Note that the pre-limiter signal may be routed to the pan pot by reconfiguring the appropriate internal jumper - see the installation section of this manual) 18 The panned signal is then routed to the ST1 and ST2 master stereo mixes via the ST1 and ST2 switches. It may also be routed to the other Group busses via the 1-2, 3-4, 5-6 and 7-8 switches. The left signal is routed to odd-numbered groups and the right signal to even-numbered groups. Note that each group is disabled from routing to itself. The post-limiter signal is also routed to the Group Output XLR on the rear connector panel Aux Outputs 19 The post-fade or pre-fade signal, depending on the position of the appropriate PRE switch, is routed to each of the 4 Level controls. Each control normally feeds its odd-numbered aux bus, however this feed is switched to its even-numbered counterpart by use of the appropriately numbered switch i.e. 2, 4, 6, 8. Note: the PRE switch may source either the pre-fade or the pre-mute signal depending upon internal jumpers - see installation section. Cue System 20 The cue system is activated by pressing the CUE button. The CUE button may be operated in latched or momentary mode, depending upon how long you hold it down for. If you press and release within approximately 0.5 seconds the button will latch. If, on the other hand you press and hold for more than 0.5 seconds then the cue will not latch. The CUE button may be reset by moving the fader away from the fully-down position. Note that if the cue button is pressed when the fader is already away from the fully-down position the AFL/PFL signal will be selected according to the position of the AFL/PFL master switch on the monitor module. Metering 21 The Peak Detect circuit monitors the output of the group mix amplifier and the post-fader signal. If either of these points comes within 6dB of clipping then the PEAK LED will illuminate. 22 The signal present circuit monitors the output of the mix amp. The SP LED illuminates when a signal is present on the Group Mix bus B800 Functional Description